Improvement in alarm-locks



J. H. P. INSLEE.

ALARM-LOCKS.

N0- 195,608. Patented Sept.25,1877.

a r r l N,PETERS, PHOYD-LITHOGRAPHER. `WASHKNGTON.` D G UNITED JOSEPH H.4l?. .INSLEE, 0F MOUNT VERNON, ASSIGNOR OF ONE-THIRD HIS PATENT OFFICE.

RIGHT TO ROBERT RUSSELL, OF NEW YORK, N. Y.

,IM PROMEMENT IN ALARM-LOCKS.

SSpecificationfformng part of LettersPatent No. 195,608, dated September25, 1877; application iled June 1e, 1877.

To all whom it may concern:

Be it known that I, JOSEPH H. l?V INsLEE, of Mount Vernon, in the countyof Westchester and State of New York, have invented certain Improvementsin Burglar-Alarms, of which the following is a specification Thisinvention relates to that class of alarms which are actuated andoperated in connection with an ordinary door-latch, the object being tolock fast the latch at the same time that the alarm is sounded.

The invention consists, essentially, in the combination of an alarmmechanism with an ordinary latch, the same being arranged in such amanner that when properlyr set any attempt to draw the latch will lockthe same fast and sound the alarm.

It also consists in the various details and combinations of themechanism, as Will be mo fully hereinafter described.

In me drawings, Figure l shows the interior mechanism of a latchembodying myimprovements. Fig. 2 is a view of the same taken from theopposite side. Fig. 3 is afront view of the same.

Let A represent a latch-case, inclosing the usual parts which go to makeup a latch. B is a knob-spindle, provided with lugs a a. C is alatch-lever, D a latch, and b a latch-spring. These parts are, or maybe, arranged in the usual manner.

Within the case containing the latch mechanism are the gong E,driving-spring F, gearwheelsc d, scape-wheelGr, pallets e e, and hammerH, of an ordinary alarm mechanism.

In the latch D is a notch, g, and on a lever, I, is a tooth, i,arranged, under certain conditions, to engage said notch g and form adetent. The lever I may fall of its own weight, or be habitually throwndown by a spring, j. Any form of detent whereby the lever I will arrestthe endwise motion of the latch D may serve the purpose as an equivalentfor that shown. A rod, k, arranged to play up and down the wall of thelatch-case, has a crossarm, l, which takes hold of the lever I. To theupper end of the rod k is secured a lip or thumb piece, o, whichprojects through an opening in the case.

It will be seen that by lifting on the lip o the free end of the lever Iis lifted, and anyV simple device which will enable the operator to liftthe said lever from the outside of the case may serve the purpose as anequivalent of' the precise construction shown.

From a cross-shaft, m, (which bears the pallets e e and the hammer H,)projects a rod or wire, n, which rests upon the cross-arm l, or it mayrest upon any projecting part of the rod k or the lever I and operateequally well, as will be understood when its function comes to bedescribed.

The operation of the mechanism is as follows: The spring which actuatesthe alarm is wound up by means of a wing-key or crank, J, the ordinaryratchet mechanism being provided, and the projecting lip o is pushedsidewise into a notch at the upper part of the aperture in the case.This holds the tooth i up out of the notch g in the latch, and permitsthe latter to move freely. It also lifts the free end of the rod n, andcauses the upper pallet e to engage the teeth of tbe scape-Wheel andserve as a detent, thus eectually preventing any movement of the alarmmechanism. This position of the parts, which is shown in Fig. l, ismaintained ordinarily during the day. .At night the lip o is pushed outof its retaining-notch, and the projection 'i then falls and rests uponthe top of the latch, from which it before stood clear, back of thenotch g. The alarm is now set, and the first movement of the latchcauses the tooth i to drop into the notch in the same. This effectuallyprevents any movement of the latch in either direction, and at the sametime it disengages the pallet from the scape-wheel and permits the alarmto sound until the spring runs down.

The action of the scape-wheel on the pallets causes the hammer to strikethe bell very rapidly.

The latch-case may be perforated on one or both sides, to avoid mufflingthe sound of the bell.

The lower part L forms a continuation of the latch-case, for thereception of a bolt, to be shot by a key.

The bolt and key form no part of my present invention, and, indeed, maybe of the ordinary kind; but the part L which contains them is separatedfrom the cavity which contains the latch by a partition, p, upon whichthe latch D rests and slides. This partition serves to prevent any onefrom tampering with the latch mechanism by inserting a tool at thekey-hole.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a burglar-alarm, an alarm mechanism inclosed within the latchcase,a latch and its operative mechanism, and a detent device arranged to actat the same time upon both alarm and latch, the whole being so arrangedthat an attempt to draw the latch locks itfast and also sets the alarmgoing at the same time, substantially as set forth.

2. The combination of a latch, D, provided with a notch, g, or itsequivalent, a lever, I,

witnesses.

J. H. P. INSLEE. Witnesses:

ARTHUR G. FRASER, SAM. TRO. SMITH.

